Aeg lamp



(No Model.)

v. KLAN & F. SPURNY.

ARC LAMP.

v I Fla. 1 Patented Feb. 15, 1887.

AMMMM N. PETERS, Phnto-Lilhcgmphor, Washingiom D. C.

UNITED STATES PATENT OFFICE.

VAOLAV KLAN AND FRANCIS SPURNY, OF PRAGUE, AUSTRIA-HUNGARY.

ARC LAMP.

SP1 C'IIIC'A'JJION forming part of Letters Patent No. 357.774, dated February 15, 1887.

Application filed December 16, 1885. Serial1\'o. 185,833. (No model.) i

To all whom it may concern:

. electric-arc lamps in whichdifierential solen oids are employed to regulate the carbons, to the end that sudden vibrations of the light may be prevented and the size of the lamp be reduced for a certain length of carbon.

The invention consistsin suspending the carbon-holders from two sets of pulleys, one for balancing the carbons and their holders by their weights, as usual, and the second set for maintaining in equilibrium against the resultant attraction of the two solenoids by means of a suitably-suspended counterpoise.

The invention also consists in making the carbon holders telescopic, whereby the increased efficiency of a long holder is obtained, while much less space is occupied, as hereinafter described.

The invention further consists in the construction, combination, and arrangement of parts, as hereinafter fully set forth, and then pointed out in the claims.

Reference is to be had to the accompanying drawings, in which Figure 1 is a side view illustrating the improved method of supporting the carbon-holders. Fig. 2 is a front elevation of the same. Fig. 3 is a sectional elevation of one telescopic carbon-holder in its expanded position. Fig. at is a similar view of the other holder contracted.

The carbon-holders A B support the carbons A B in the ordinary manner, and their positions are regulated so as to render the are light continuous as the carbons A B are consumed by the attraction ofi twov differential solenoids which surround the holders AB, and through which the electric current passes, as usual. Thus the main current passes through the right-hand course or low-resistance solenoid, Fig. 1, thence by a suitable yielding con tact through the corresponding carbon-holder, A, moving vertically therein through the carbons A B, forming the arc, and thence through the holder B. back to the dynamo.

The holder 13 moves vertically within ahighresistance solenoid interposed in a shunt-circuit, as shown.

The holders A and B are suspended from a fixed pulley, R, by the cord T, passed over the same and attached at its ends to the holders, whereby the weights of the holders and their carbons are counterbalanced in the usual manner. Then as the carbons are consumed the arc is lengthened, and the resistance of the main circuit being increased the current passing through the shunt -circuit is increased, causing the corresponding solenoid to attract its armature or holder B more strongly than does the low-resistance solenoid its armature or holder A. The holder .13 is thus drawn down, raising the holder A through their cordconnection and shortening the are, all as heretofore described. Thus the length of the arc has been regulated and the lightmaintained comparatively steady; but owing to the fluctuations in the main current and in the length of arc the difference between the attractions of the two solenoids upon their respective holders is apt to vary suddenly, the attraction of the one being increased more than that of the other is decreased, or the reverse. The tendency of this would be to draw one holder down farther than the other is allowed to rise from the decreased attraction of its solenoid, thus suddenly tightening the cord T; or, in the other case, the opposite would happen-that is, one holder would tend to rise l'arther than the other holder would fall, thus suddenly slackening the cord T. In either case a vibration of the light would result, and on the return of the carbons to their proper positions, caused by the regulating action of the differential solenoids, a second sudden vibration would be caused. To obviate this difficulty I suspend the carbon-holders A B from the ends of 'a cord, S, which is passed over the fixed pulleys a b and then under a movable pulley, d, to which is attached a suitable counterpoise, Q. \Vith this arrangement, when one carbon tends to shift relatively more than the other, so as to tighten or slacken the primary suspension-cord T, such movement would tend to raise or lower the counterpoise Q, the weight of which would resist the sudden movement,

causing the carbons to approach or recede from each other with uniform velocity, thus preventing the vibrations of the are.

Instead of the single pulley It, aset of fixed pulleys may be used, if desired. The pulleys a, Z), and (Z might also be substituted by any other suitable arrangement embodying a movable pulley and counterpoise.

I11 order that a lamp thus constructed may not be unnecessarily enlarged, we prefer to form the carbon-holders A B in telescopic fashion, as illustrated in Figs. 3 and 4. As therein shown, the enlarged armature portion of each holder A B is made about half the length of that illustrated in Figs. 1 and 2, and slides within a tube, A B, the lower end of each armature being provided with a head, a, which abuts against an internal collar, m, on each tube A B, so as to limit the motion of the tube on the armature. XVith this construction of the holder, when expanded as in Fig. 3, and the lower end of the tube B being within the corresponding solenoid, the latter acts upon the tube which forms an armature, so as to attract and draw down the same, and with it the holder 13, thus lowering the carbon as it is consumed.

Then the tube 13 comes into its position of equilibrium within the solenoid, so as to remain at rest therein, the inner armature, having by that time been drawn within the range oi'attraetion of the solenoid, is likewise drawn down by the same, sliding within the tube B, until it is in equilibrium, when it will be en tirely within the tube, the latter having meanwhile remained stationary. The opposite holder, A, will act in a similar manner, butin a reverse direction, the inner armature being primarily within the tube, and then gradually withdrawn from the same until limited by its head a, when the tube is similarly drawn through the solenoid. The effective length of the armature is thus that of the external tube combined with one-half that of the inner armature, while the ordinary armature is moved through a distance equal to one-half its length, and its effective length thusiene-half less than that constructed according to my invention.

The length of the lamp can thus be materially reduced while providing for the same length of carbons.

Having thus fully described our invention, we claim as new and "desire to secure by Letters Patent 1. In an electric lamp, the combinatiomwith two carbon-holders, of two independent systems of pulleys, and cords passed over each 3. In an electric lamp, the combination, with.

two carbon-holders, of solenoids in which they can slide, two systems of pulleys, and independent cords passed over the pulleys of the two systems, both ends of both cords being connected with the carbon holders, substanstantially as herein shown and described.

4. In an electriclamp,theeombinatiomwith a carbon-holder, of a tube in which the same can slide, said tube being mounted to slide in a solenoid, substantially as herein shown and described.

5. An electric lamp provided with telescopie carbon-holders, substantially as herein shown and described.

6. In an electriclamp, the conibinatiomwith the tube B", having the internal collar, m, at one of its ends, of the sliding carbon-holder B, provided with the head or piston or at one end, substantially as herein shown and described.

'VAOLAV KLAN. FRANCIS SPURNY. 'Witnesses:

KAREL HAJN 1', JAN XYTIA PURKYNEY. 

